Joey Nevin, Giants director of sales and marketing (left), in the new Gotham Clubhouse with former first baseman J.T. Snow.

Photo: Catherine Bigelow, Special To The Chronicle

Joey Nevin, Giants director of sales and marketing (left), in the...

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Joyce Newstat, left, and Susan Lowenberg enjoy drinks at the Gotham Club on opening day, April 8, 2014 in San Francisco, Calif. In their home opener, a day game, the San Francisco Giants face the Arizona Diamondbacks. The Gotham Club is a multi-part social club at AT&T park that includes a bay cruise, an on-field bar before the game, and a speakeasy-style area within the park that includes a bowling alley and game room.

Mladen Vucicevic, right, and his friend Debbie Idiart look at photos alluding to the Giants' history on a wall in the Gotham Club on opening day, April 8, 2014 in San Francisco, Calif. In their home opener, a day game, the San Francisco Giants face the Arizona Diamondbacks. The Gotham Club is a multi-part social club at AT&T park that includes a bay cruise, an on-field bar before the game, and a speakeasy-style area within the park that includes a bowling alley and game room.

Photo: Pete Kiehart, The Chronicle

Mladen Vucicevic, right, and his friend Debbie Idiart look at...

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Bartender Anthony Wendlberger rings up a customer's order at the Gotham Club on opening day, April 8, 2014 in San Francisco, Calif. In their home opener, a day game, the San Francisco Giants face the Arizona Diamondbacks. The Gotham Club is a multi-part social club at AT&T park that includes a bay cruise, an on-field bar before the game, and a speakeasy-style area within the park that includes a bowling alley and game room.

Photo: Pete Kiehart, The Chronicle

Bartender Anthony Wendlberger rings up a customer's order at the...

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Heather Malovos bowls at the Giants' Gotham Club on opening day, April 8, 2014 in San Francisco, Calif. In their home opener, a day game, the San Francisco Giants face the Arizona Diamondbacks. The Gotham Club is a multi-part social club at AT&T Park that includes a bay cruise, an on-field bar before the game, and a speakeasy-style area within the park that includes a bowling alley and game room.

Photo: Pete Kiehart, The Chronicle

Heather Malovos bowls at the Giants' Gotham Club on opening day,...

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Heather Malovos and her two daughters Meriel, 7, left, and Margot, 6, watch Wai Bosco bowl at the Giants' Gotham Club on opening day, April 8, 2014 in San Francisco, Calif. In their home opener, a day game, the San Francisco Giants face the Arizona Diamondbacks. The Gotham Club is a multi-part social club at AT&T Park that includes a bay cruise, an on-field bar before the game, and a speakeasy-style area within the park that includes a bowling alley and game room.

Photo: Pete Kiehart, The Chronicle

Heather Malovos and her two daughters Meriel, 7, left, and Margot,...

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Employees on a boat that is part of the Gotham Club, look towards AT&T park on opening day, April 8, 2014 in San Francisco, Calif. In their home opener, a day game, the San Francisco Giants face the Arizona Diamondbacks. The Gotham Club is a multi-part social club at AT&T park that includes a bay cruise, an on-field bar before the game, and a speakeasy-style area within the park that includes a bowling alley and game room.

Photo: Pete Kiehart, The Chronicle

Employees on a boat that is part of the Gotham Club, look towards...

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Don Neely's Royal Society plays music for fans on a boat that is part of the Giants' Gotham Club on opening day, April 8, 2014 in San Francisco, Calif. In their home opener, a day game, the San Francisco Giants face the Arizona Diamondbacks. The Gotham Club is a multi-part social club at AT&T park that includes a bay cruise, an on-field bar before the game, and a speakeasy-style area within the park that includes a bowling alley and game room.

Photo: Pete Kiehart, The Chronicle

Don Neely's Royal Society plays music for fans on a boat that is...

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Fans watch players warm up from the on-field bar portion of the Gotham Club on opening day, April 8, 2014 in San Francisco, Calif. In their home opener, a day game, the San Francisco Giants face the Arizona Diamondbacks. The Gotham Club is a multi-part social club at AT&T park that includes a bay cruise, an on-field bar before the game, and a speakeasy-style area within the park that includes a bowling alley and game room.

Photo: Pete Kiehart, The Chronicle

Fans watch players warm up from the on-field bar portion of the...

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AT&T Park is seen from a boat that is part of the Giants' Gotham Club on opening day, April 8, 2014 in San Francisco, Calif. In their home opener, a day game, the San Francisco Giants face the Arizona Diamondbacks. The Gotham Club is a multi-part social club at AT&T park that includes a bay cruise, an on-field bar before the game, and a speakeasy-style area within the park that includes a bowling alley and game room.

Photo: Pete Kiehart, The Chronicle

AT&T Park is seen from a boat that is part of the Giants'...

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Interior details of Gotham Club, a new members-only club inside AT&T Park named after the original team that eventually became the Giants in San Francisco, Calif. on Tuesday, March 25, 2014.

Photo: Russell Yip, The Chronicle

Interior details of Gotham Club, a new members-only club inside...

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Interior details of Gotham Club, a new members-only club inside AT&T Park named after the original team that eventually became the Giants in San Francisco, Calif. on Tuesday, March 25, 2014.

Photo: Russell Yip, The Chronicle

Interior details of Gotham Club, a new members-only club inside...

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Former San Francisco Giants player JT Snow stands for a portrait at The Gotham Club, a new members-only club inside AT&T Park named after the original team that eventually became the Giants in San Francisco, Calif. on Tuesday, March 25, 2014.

Photo: Russell Yip, The Chronicle

Former San Francisco Giants player JT Snow stands for a portrait at...

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Interior details of Gotham Club, a new members-only club inside AT&T Park named after the original team that eventually became the Giants in San Francisco, Calif. on Tuesday, March 25, 2014.

Photo: Russell Yip, The Chronicle

Interior details of Gotham Club, a new members-only club inside...

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Interior details of Gotham Club, a new members-only club inside AT&T Park named after the original team that eventually became the Giants in San Francisco, Calif. on Tuesday, March 25, 2014.

The on-field results Friday from the Giants-Dodgers game were depressing, to say the least.

But on that sizzling summer night, AT&T Park still burst with good vibes. And there was no other place this 300th consecutive homestand, regular-season sellout crowd would've rather been. (A streak, we might add, which is currently the longest-running in the majors.)

Some of that good feeling was emanating from right field, behind the out-of-town scoreboard, where, a day earlier, Giants CEO-President Larry Baer unveiled the just-completed Gotham Clubhouse - a swanky new speakeasy-style private space (composed of a cocktail lounge and restaurant) reserved for club members.

"The Gotham Club grew out of our commitment to celebrate our 132-year-old franchise history, when we were established in 1883 as the New York Gothams Baseball Club," Baer said. "This clubhouse pays tribute to the Giants' old clubhouse at the Polo Grounds, which was located above the outfield and had windows looking out on the field of play."

These new clubhouse windows are small scale and alternate between wood squares that staffers manually manipulate to update the scores of other MLB teams.

Joining the Gotham Club's Game Room and Bullpen, this clubhouse is the latest secret build-out within the ballpark for club members. It stretches from below the cable car atop the arcade, over part of Triples Alley and along right field next to the Virgin America Loft. The three Gotham spaces are open only on game days and were meticulously designed from empty space.

"We do things differently not just here at the Giants ballpark but also here in San Francisco," enthused Alfonso Felder, the Giants senior VP of administration. "Our fans have a great reverence for our history: They want to get behind the scene, they want a unique vantage point, and they want great views."

The old Polo Grounds may occupy a mythic level of memory, but that original, 1880 stadium lacked a key only-in-S.F. component: McCovey Cove.

Directly across from peek-hole views of the verdant field, this buoyant body of blue shimmers in a long row of arched picture windows framing the clubhouse's lounge and restaurant walls.

That cove, of course, is named for the great Willie McCovey. And his name and jersey number also inspire the Cove, the club's signature libation. Imbibers may gasp at its $44 price tag, but its mathematics are an homage to McCovey's jersey number and the fact that the cocktail - which arrives in a bowl with a floating baseball-shaped ice cube - can sate four.

"This is our answer to a 'Scorpion Bowl,' " joked Giants Enterprises VP-GM Stephen Revetria. "Between the club and new edible garden, no other MLB stadium is doing what we do here for our fans."

Most details and decor within the three Gotham Club spaces are a heartfelt homage to the team's long history of players, coaches and owners.

And Joey Nevin, the Giants director of sales and marketing, has dedicated himself to tracking down treasured baseball mementos - from historic photographs, mitts, board games, baseball cards and VHS films to a library of books.

In fact, his unschooled, design expertise is so superlative throughout the Gotham spaces that opening-day clubhouse guests encouraged Nevin to seek a sideline creating one-of-a-kind interiors. But this baseball die-hard demurred. Unless, he joked, he specialized in sports-themed man caves.

"I found a lot of the club's memorabilia on eBay, at flea markets and even in my parents' garage," said this EssEff native and Sacred Heart High grad. "But I've loved landing old sports trophies topped with the figure of a baseball player. Even if they're from a Minnesota Peewee League, they enhance the look of the Gotham Club and only cost about $1."